NAME

SYNOPSIS

DESCRIPTION

The function statvfs() returns information about a mounted file system.
path is the pathname of any file within the mounted filesystem. buf is
a pointer to a statvfs structure defined approximately as follows:
struct statvfs {
unsigned long f_bsize; /* file system block size */
unsigned long f_frsize; /* fragment size */
fsblkcnt_t f_blocks; /* size of fs in f_frsize units */
fsblkcnt_t f_bfree; /* # free blocks */
fsblkcnt_t f_bavail; /* # free blocks for non-root */
fsfilcnt_t f_files; /* # inodes */
fsfilcnt_t f_ffree; /* # free inodes */
fsfilcnt_t f_favail; /* # free inodes for non-root */
unsigned long f_fsid; /* file system ID */
unsigned long f_flag; /* mount flags */
unsigned long f_namemax; /* maximum filename length */
};
Here the types fsblkcnt_t and fsfilcnt_t are defined in <sys/types.h>.
Both used to be unsignedlong.
The field f_flag is a bit mask (of mount flags, see mount(8)). Bits
defined by POSIX are
ST_RDONLY
Read-only file system.
ST_NOSUID
Set-user-ID/set-group-ID bits are ignored by exec(3).
It is unspecified whether all members of the returned struct have
meaningful values on all filesystems.
fstatvfs() returns the same information about an open file referenced
by descriptor fd.

RETURNVALUE

On success, zero is returned. On error, -1 is returned, and errno is
set appropriately.

ERRORS

EACCES (statvfs()) Search permission is denied for a component of the
path prefix of path. (See also path_resolution(7).)
EBADF (fstatvfs()) fd is not a valid open file descriptor.
EFAULTBuf or path points to an invalid address.
EINTR This call was interrupted by a signal.
EIO An I/O error occurred while reading from the file system.
ELOOP (statvfs()) Too many symbolic links were encountered in
translating path.
ENAMETOOLONG
(statvfs()) path is too long.
ENOENT (statvfs()) The file referred to by path does not exist.
ENOMEM Insufficient kernel memory was available.
ENOSYS The file system does not support this call.
ENOTDIR
(statvfs()) A component of the path prefix of path is not a
directory.
EOVERFLOW
Some values were too large to be represented in the returned
struct.

CONFORMINGTO

POSIX.1-2001

NOTES

The Linux kernel has system calls statfs(2) and fstatfs(2) to support
this library call.
The current glibc implementations of
pathconf(path, _PC_REC_XFER_ALIGN);
pathconf(path, _PC_ALLOC_SIZE_MIN);
pathconf(path, _PC_REC_MIN_XFER_SIZE);
respectively use the f_frsize, f_frsize, and f_bsize fields of the
return value of statvfs(path,buf).